Eisenack, 1954a
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Eisenack, A., 1954a: Hystrichosphären aus dem baltischen Gotlandium. Senckenbergiana, v.34, no.4-6, p.205-211, pl.1.
Eisenack, A., 1954a: Hystrichosphären aus dem baltischen Gotlandium. Senckenbergiana, v.34, no.4-6, p.205-211, pl.1.